Why bad economic theories remain popular, by Steven Saville.
Ludwig von Mises and Friedrich Hayek, the most prominent “Austrian” economists of the time, anticipated the 1929 stock market crash and correctly predicted the dire consequences of government attempts to artificially stimulate economic growth in the aftermath of the crash. John Maynard Keynes, on the other hand, was totally blindsided by the stock market crash and the economic disaster of the early 1930s. And yet, Keynes’s theories gained enormous popularity during the 1930s whereas the work of Mises and Hayek was largely ignored. Why was it so?
Keynes became popular because he told the politically powerful what they wanted to hear. In particular, he provided power-hungry politicians with intellectual support for the schemes they not only already had in mind, but in many cases were already putting into practice.
Despite being riddled with errors, Keynes’ theories also appealed to many economists because the implementation of these theories would confer a lot more influence upon the economics fraternity. The fact is that in a free economy there wouldn’t be much for an economist to do other than teach economics. He/she would certainly never have the opportunity to be involved in the ‘management’ of the economy. …
John Maynard Keynes, 1933
Banks and governments love Keynesian theories, because they excuse or instruct them to manufacture more money — relieving politicians some of the burden of raising money through taxes, and making profits for the bankers. Since the 1930s. banks and governments have done everything possible to promote Keynesian theories, including meddling in university education since the 1950s such that it is almost impossible to get a PhD in economics without being a Keynesian.
As far as I can tell, the theories have stayed popular for three main reasons. First, not only do they mesh with the personal goals of almost all current politicians, but also there is now a huge government apparatus in place that depends upon the continued application of these theories. In other words, a large chunk of the population now has a vested interest in perpetuating the myth that the government should ‘manage’ the economy.
Second, it usually isn’t possible to disprove an economic theory using data, because the same data can usually be interpreted in different ways and used to justify opposing theories. The hard reality is that in the science of economics you must start with the correct theory in order to correctly interpret the data.
Third, Keynesianism is more like a stream of anecdotes than a coherent theory, in that under this so-called theory most things are ‘explained’ by unforeseeable events and unpredictable shifts in “animal spirits”. It is impossible to invalidate an intellectual position that is constantly changing.